The Sierra Club says Ameren has been routinely violating air quality standards at its St. Louis-area power plants.

In a Notice of Intent to Sue delivered to Ameren on Wednesday afternoon, the Sierra Club alleges the company's Labadie, Meramec, and Rush Island plants have exceeded air pollution limits almost 10,000 times since 2008.

The analysis of the 100 largest urban areas in the country by the U.S. Public Interest Research Group found that since 2000, fewer commuters are using cars to get to work. And in most cities, the use of public transportation has gone up (since 2005), and more people are biking to work or working from home (since 2000).

But, in St. Louis, the trend is less clear. Fewer workers are relying on cars, but the use of public transportation has also decreased.

A lot has changed in the world of baseball since 1946. But a familiar pair of elite teams are once again playing in the Fall Classic. For the fourth time, the St. Louis Cardinals are facing off against the Boston Red Sox in the World Series. Previous matchups took place in 1946, 1967 and 2004.

And this year's matchup has some striking similarities to the team's first meeting in 1946. Then, as now, St. Louis Cardinals defeated the Dodgers in playoffs before facing off against the Red Sox.